CN211312564U - Strong permeable stratum deep foundation pit underground water control structure based on depressurization and permeability reduction - Google Patents
Strong permeable stratum deep foundation pit underground water control structure based on depressurization and permeability reduction Download PDFInfo
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- CN211312564U CN211312564U CN201820031181.8U CN201820031181U CN211312564U CN 211312564 U CN211312564 U CN 211312564U CN 201820031181 U CN201820031181 U CN 201820031181U CN 211312564 U CN211312564 U CN 211312564U
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Abstract
The utility model discloses a strong permeable stratum deep foundation pit underground water control structure based on depressurization and permeability reduction, wherein a retaining structure is arranged around a foundation pit; a foundation pit bottom plate is arranged at the bottom of the foundation pit in the enclosure structure; and a pressure reduction and seepage reduction layer is arranged in the enclosure structure below the foundation pit bottom plate. The utility model discloses the strong operability, the engineering of being convenient for is used, and the construction degree of difficulty is little, and engineering cost is low.
Description
Technical Field
The utility model relates to a deep basal pit construction site groundwater's processing field, especially a stratum deep basal pit groundwater control structure permeates water by force based on step-down subtracts and oozes.
Background
When the deep foundation pit excavation construction is carried out on the stratum with high water permeability, underground water must be controlled, otherwise engineering accidents such as piping, quicksand, instability of the bottom of the foundation pit, instability and collapse of the whole foundation pit and the like are easily caused at the bottom of the foundation pit.
At present, the methods for controlling the underground water for the deep foundation pit construction of the strongly permeable stratum at home and abroad mainly comprise the following methods.
(1) Open drainage method. The method does not set any waterproof curtain measures, and directly sets a dewatering well in the foundation pit to discharge the underground water in the foundation pit out of the foundation pit. According to the method, the underground water inside and outside the foundation pit is communicated, a large amount of underground water needs to be discharged in the foundation pit construction process, the drainage cost is high, the foundation pit precipitation can cause the formation around the foundation pit to have obvious settlement, and the use safety of buildings around the foundation pit is influenced. This method is therefore generally only available when the water level drops to a small extent.
(2) A vertical waterproof curtain method. According to the method, an underground continuous wall or a stirring pile and the like are used as a vertical waterproof curtain at the outer side of a deep foundation pit, the bottom of the vertical waterproof curtain extends into a bedrock waterproof layer, hydraulic connection inside and outside the foundation pit is completely blocked, and only underground water inside the foundation pit needs to be removed in foundation pit excavation construction. The method is more practical when the water-resisting layer is buried to a shallow depth, and when the water-resisting layer at the bottom of the foundation pit is buried to a deep depth, the construction difficulty of the vertical water-stopping curtain is high, the cost is high, the construction quality cannot be guaranteed, and engineering accidents such as foundation pit instability and the like caused by water leakage of the curtain often occur.
(3) Vertical suspension type waterproof curtain. According to the method, aiming at the condition that the buried depth of a water-resisting layer at the bottom of a foundation pit is large, a vertical water-stopping curtain is still adopted, but the depth of the curtain is small, the curtain does not extend into the water-resisting layer, and a drainage well is adopted for pumping water in the foundation pit during foundation pit construction. The method can reduce the drainage of the foundation pit to a certain extent, but because the vertical curtain does not separate the connection of the groundwater inside and outside the foundation pit, a large amount of groundwater still needs to be discharged in the construction process of the foundation pit, the drainage cost is high, the precipitation of the foundation pit can cause the remarkable sedimentation of the stratum around the foundation pit, and the use safety of the buildings around the foundation pit is influenced; particularly for a deep foundation pit near a river, the underground water level in the foundation pit is difficult to drop to a preset depth, and the drainage cost is extremely high.
(4) Horizontal bottom sealing method. The method also aims at the condition that the buried depth of the water-resisting layer at the bottom of the foundation pit is large, the underground water is controlled by combining the vertical water-stopping curtain and the horizontal bottom-sealing curtain, and only underground water in the foundation pit needs to be removed in the foundation pit excavation construction. The method also completely cuts off the hydraulic connection of the underground water inside and outside the foundation pit, only the underground water inside the foundation pit needs to be removed in the foundation pit excavation construction, but the horizontal back cover curtain at the bottom of the foundation pit bears the great underground water pressure and the great soil pressure, so that the horizontal back cover curtain is easily damaged under the combined action of the water pressure and the soil pressure, the horizontal back cover curtain needs to be arranged at the depth of about 15-25m below the bottom plate of the foundation pit in the actual construction, the corresponding vertical curtain needs to be arranged at the corresponding depth, the horizontal and vertical curtains are difficult to construct, the cost is high, and the construction quality cannot be guaranteed.
According to the analysis, the existing control method for the construction underground water of the deep foundation pit excavation in the strongly permeable stratum at home and abroad mainly adopts two modes of full drainage and full plugging at present. The full drainage method has high drainage cost, great influence on the surrounding environment and great precipitation difficulty when water sources exist around the foundation pit. The full plugging method has high construction difficulty and cost and difficult guarantee of construction quality.
Therefore, the development of a new underground water control structure for the construction of the deep foundation pit of the strongly permeable stratum, which is safe, reliable, low in construction difficulty and low in construction cost, is urgently needed.
Disclosure of Invention
The utility model aims to solve the technical problem that, it is not enough to prior art, provide a strong operability, the engineering of being convenient for is used, and the construction degree of difficulty is little, and engineering cost is low subtracts the stratum deep basal pit groundwater control structure that permeates water by force based on the step-down that oozes.
In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a strong permeable stratum deep foundation pit underground water control structure based on depressurization and permeability reduction is characterized in that a retaining structure is arranged around a foundation pit; a foundation pit bottom plate is arranged at the bottom of the foundation pit in the enclosure structure; and a pressure reduction and seepage reduction layer is arranged in the enclosure structure below the foundation pit bottom plate.
And a water-resisting layer is arranged below the pressure reduction and permeation reduction layer, so that the permeation reduction effect is further ensured.
The pressure reduction and permeability reduction layer is arranged below 2m of the bottom surface of the foundation pit bottom plate, and the pressure reduction and permeability reduction layer is remarkably reduced compared with the permeability of the stratum at the bottom of the original foundation pit.
The permeability coefficient of the pressure-reducing permeability-reducing layer is 1% of that of the bottom element of the foundation pit, the thickness of the pressure-reducing permeability-reducing layer is 5-6 m, and the effects of reducing the pressure of underground water and reducing the water seepage amount are achieved.
And the distance between the bottom surface of the pressure reduction and permeability reduction layer and the bottom end of the enclosure structure is more than 1m so as to prevent underground water from entering the foundation pit from two sides of the foundation pit.
Be provided with the drainage well in the foundation ditch, be convenient for will discharge outside the foundation ditch through the groundwater that subtracts in the infiltration layer infiltration foundation ditch.
Compared with the prior art, the utility model discloses the beneficial effect who has does: adopt the utility model discloses a structure, the water yield of the groundwater that needs to get rid of the foundation ditch is showing and is reducing, and the time and the expense of foundation ditch drainage all can show and reduce, and the groundwater level change of the outside stratum of foundation ditch is very little simultaneously, to the almost produced influence of the environment of foundation ditch periphery. More traditional deep basal pit groundwater control method of full shutoff, the utility model discloses a step-down subtracts the infiltration layer and can directly set up below the foundation ditch bottom plate, and traditional horizontal water barrier need set up the degree of depth more than 15m under the foundation ditch bottom plate, sets up reducing by a wide margin of the degree of depth and makes the step-down subtract the construction degree of difficulty of infiltration layer and show and reduce, and engineering cost also is showing and is reducing, and construction quality has also obtained effective assurance.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention;
the foundation pit comprises a foundation pit bottom plate, a foundation pit, a pressure reduction and permeability reduction layer and a water-resisting layer, wherein the pressure reduction and permeability reduction layer comprises 1-earth surface, 2-underground water level, 3-enclosure structure (vertical water-stopping curtain), 4-foundation pit bottom plate, 5-foundation pit, 6-pressure reduction and permeability reduction layer and 7-foundation pit bottom water-resisting layer.
Detailed Description
As shown in fig. 1, the embodiment of the present invention includes a foundation pit 5, and an enclosure structure 3 is arranged around the foundation pit 5; a foundation pit bottom plate 4 is arranged at the bottom of a foundation pit 5 in the enclosure structure 3; and a pressure reduction and permeation reduction layer 6 is arranged in the enclosure structure 3 below the foundation pit bottom plate 4.
A water-resisting layer 7 is arranged below the pressure-reducing and permeability-reducing layer 6.
According to the specific position of the deep foundation pit of the strongly permeable stratum, firstly, constructing an underground continuous wall enclosure structure around the foundation pit, wherein the enclosure structure is also used as a vertical waterproof curtain of the foundation pit and is required to not generate water leakage, and the depth of the underground continuous wall is determined according to the safety of foundation pit excavation and is required to reach 1m below a base plate of a pressure reduction and permeability reduction layer.
The construction of a pressure reduction and permeability reduction layer is carried out from the ground surface of the foundation pit by adopting sleeve valve pipe grouting or a deep horizontal stirring pile, the pressure reduction and permeability reduction layer is positioned below 2m of the bottom surface of the foundation pit, the permeability coefficient of the pressure reduction and permeability reduction layer is about 1% of that of the original stratum at the bottom of the foundation pit so as to achieve the effects of reducing the pressure of underground water and reducing the water seepage amount, and the thickness of the pressure reduction and permeability reduction layer is 4-5 m.
And after the construction of the pressure reduction and permeability reduction layer at the bottom of the foundation pit is completed, carrying out excavation construction of the deep foundation pit. A drainage well needs to be arranged inside the foundation pit in the foundation pit excavation construction process, and underground water permeating into the foundation pit through the depressurization permeability-reducing layer is discharged out of the foundation pit.
The utility model utilizes the certain permeability of the pressure-reducing and permeability-reducing layer at the bottom of the foundation pit to allow part of the groundwater to permeate into the foundation pit through the pressure-reducing and permeability-reducing layer so as to achieve the purpose of reducing the water pressure acting on the bottom of the pressure-reducing and permeability-reducing layer, thereby ensuring the stability of the pressure-reducing and permeability-reducing layer at the bottom of the foundation pit and the bottom plate of the foundation pit; meanwhile, the low permeability of the pressure reduction and permeability reduction layer is utilized to reduce the groundwater entering the foundation pit through the pressure reduction and permeability reduction layer so as to achieve the function of permeability reduction, thereby obviously reducing the drainage difficulty and the drainage cost of the foundation pit and ensuring the safety of buildings around the foundation pit.
Claims (10)
1. A pressure reduction and permeability reduction-based underground water control structure for a deep foundation pit of a strongly permeable stratum comprises a foundation pit (5); the foundation pit is characterized in that a pressure reduction and permeability reduction layer (6) is arranged at the bottom of the foundation pit (5).
2. The pressure reduction and permeability reduction based deep foundation pit underground water control structure for the strongly permeable stratum according to claim 1, wherein a building enclosure (3) is arranged around the foundation pit (5).
3. The pressure reduction and permeability reduction based deep foundation pit underground water control structure of the strongly permeable stratum according to claim 2, wherein a foundation pit bottom plate (4) is arranged at the bottom of a foundation pit (5) in the enclosure structure (3).
4. The pressure reduction and permeability reduction based deep foundation pit underground water control structure of the strongly permeable stratum according to claim 3, wherein the pressure reduction and permeability reduction layer (6) is arranged in a building enclosure (3) below the foundation pit bottom plate (4).
5. The structure for controlling the groundwater of the deep foundation pit of the water-permeable stratum based on depressurization and permeability reduction of claim 1, wherein a water-resisting layer (7) is arranged below the depressurization and permeability reduction layer (6).
6. The structure for controlling the groundwater in the deep foundation pit of the water-permeable stratum based on depressurization and permeability reduction of claim 3, wherein the depressurization and permeability reduction layer (6) is arranged below 2m of the bottom surface of the foundation pit bottom plate (4).
7. The structure for controlling the groundwater of the deep foundation pit of the water-permeable stratum based on depressurization and permeability reduction of claim 1, wherein the permeability coefficient of the depressurization and permeability reduction layer (6) is 1% of the permeability coefficient of the original stratum at the bottom of the foundation pit (5).
8. The structure for controlling the underground water of the deep foundation pit of the strongly permeable stratum based on the pressure reduction and permeability reduction of claim 1, wherein the thickness of the pressure reduction and permeability reduction layer (6) is 5-6 m.
9. The structure for controlling the groundwater of the deep foundation pit of the water-permeable stratum based on depressurization and permeability reduction of claim 4, wherein the distance between the bottom surface of the depressurization and permeability reduction layer (6) and the bottom end of the enclosure structure (3) is more than 1 m.
10. The structure for controlling the groundwater in the deep foundation pit of the stratum with high permeability and low permeability based on depressurization and permeability according to any one of claims 1 to 9, wherein a drainage well is arranged in the foundation pit (5).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820031181.8U CN211312564U (en) | 2018-01-09 | 2018-01-09 | Strong permeable stratum deep foundation pit underground water control structure based on depressurization and permeability reduction |
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| CN201820031181.8U CN211312564U (en) | 2018-01-09 | 2018-01-09 | Strong permeable stratum deep foundation pit underground water control structure based on depressurization and permeability reduction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104144A (en) * | 2018-01-09 | 2018-06-01 | 中南大学 | Subtract the highly permeable stratum deep basal pit Groundwater Control method and structure oozed based on decompression |
| CN113293773A (en) * | 2021-06-30 | 2021-08-24 | 中铁二十三局集团第二工程有限公司 | Foundation pit supporting system and construction method thereof |
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2018
- 2018-01-09 CN CN201820031181.8U patent/CN211312564U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108104144A (en) * | 2018-01-09 | 2018-06-01 | 中南大学 | Subtract the highly permeable stratum deep basal pit Groundwater Control method and structure oozed based on decompression |
| CN113293773A (en) * | 2021-06-30 | 2021-08-24 | 中铁二十三局集团第二工程有限公司 | Foundation pit supporting system and construction method thereof |
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